Looking to upgrade your galley? These 27 x 16 inch RV sinks are built for an undermount install. Some can also be set as a drop-in using silicone sealant and kept weighted while it cures. For a true undermount, some may require separate standard hardware, so match your cutout and mounting method before you start.
Yes, several installs used an undermount sink as a drop-in. Test fit the opening so there's no play; add shims if needed. Run a bead of silicone or similar sealant under the rim, set the sink, and weight it while it cures. Since there are no top-mount tabs, the sealant bond is what holds it in place.
Undermount RV sinks typically do not have faucet holes. Install the faucet through the countertop and cut the hole where you want it. If you're adding accessories like a soap dispenser, plan and hole-saw those openings in the counter before setting the sink.
Not all undermount RV sinks include hardware. Plan to use standard undermount sink hardware if you're installing below the counter. For a drop-in install, silicone sealant with the sink weighted while it cures is a common approach. If the sink arrives with only drop-in brackets, you'll need to source undermount clips separately.
Measure your countertop cutout and compare to the sink's outside size. Check the corner radius of your opening so the rim sits flat. If your old cutout already matches closely, an undermount can also be set as a top mount using sealant. If there's side-to-side movement in the opening, add shims before sealing to help prevent shifting.
It can. Some installations required extra plumbing work when the new sink was deeper, while others needed a drain extension when it was a little shallower. Check the new basin depth against your trap height and make adjustments to the drain or tailpiece as needed before final mounting.
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